i6o 



GRAMINEAE. 



VOL. I. 



68. Panicum malacophyllum Nash. Soft- 

 leaved Panic-grass. Fig. 378. 



P. malacophyllum Nash, Bull. Torr. Club, 24: 198. 1897. 



Culms i-2 tall, slender, finally somewhat 

 branched above, papillose-hirsute with long spread- 

 ing hairs, the nodes-densely barbed ; sheaths papillose- 

 hirsute with long spreading hairs; blades 2-4' long, 

 2$"-6" wide, lanceolate, ascending, softly pubescent 

 on both surfaces ; panicle up to 2\' long, its axis and 

 spreading branches densely hirsute with spreading 

 hairs; spikelets \\"-\\" long, broadly oval or obo- 

 void, densely hirsute with long spreading hairs'. 



In sandy woods, Missouri to Texas ; also in Ten- 

 nessee. May-July. 



69. Panicum scabriusculum. Ell. Tall Swamp 

 Panic-grass. Fig. 379. 



P. scabriusculum Ell. Bot. S. C. & Ga. i: 121. 1817. 



Culms up to 6 tall, roughened, glabrous or 

 minutely pubescent, finally branched; sheaths nearly 

 glabrous or papillose-hispid; ligule very short; 

 blades 4'-8' long, 4"-6" wide, ascending or spread- 

 ing, sometimes reflexed, linear-lanceolate, glabrous ; 

 panicle 4'-8' long, its branches spreading or ascend- 

 ing; spikelets lanceolate, glabrous or minutely pu- 

 bescent, strongly nerved, acute, about li" long and 

 \" wide, ovate to ovate-lanceolate. 



In swampy places and ponds, Maryland to V/est 

 Virginia, Florida and Texas. May-Aug. 



Panicum cryptanthum Ashe, differs by its smaller 

 size, glabrous sheaths, and unbranched culms, and occurs 

 from New Jersey to Florida and Texas. 



70. Panicum aculeatum Hitchc. & Chase. 

 Tall Rough Panic-grass. Fig. 380. 



P. aculeatum Hitchc. & Chase, IlLodora, 8: 209. 1906. 



Culms 3-4 tall, tufted, rough, sometimes hispid 

 below; sheaths papillose-hispid, or the upper ones 

 glabrous; ligule a mere ring; blades 4'-8' long, 

 4"-?" wide, linear, elongated, s'.iff, ascending or 

 erect, usually rough ; panicle 3'-$' long, nearly as 

 wide, its branches spreading or ascending; spikelets 

 15" long, elliptic, glabrous or nearly so, the first 

 scale i-J as long a3 the spikelet, the second and third 

 scales neither so prominently nor so sharply nerved 

 as in the above species. 



In swampy woods, New York to District of Columbia 

 and North Carolina. July. 



